AT HOME CORP
424B4, 1999-05-20
COMPUTER PROGRAMMING, DATA PROCESSING, ETC.
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<PAGE>   1
                                                Filed Pursuant to Rule 424(b)(4)
                                                Registration No. 333-72669

 
PROSPECTUS
                                  AT HOME LOGO
 
                              AT HOME CORPORATION
                    919,000 SHARES OF SERIES A COMMON STOCK
 
                           -------------------------
 
At Home's Series A common stock currently trades on the Nasdaq National Market.
Last reported sale price on May 19, 1999: $146.375 per share.
Trading Symbol: ATHM
 
                           -------------------------
 
                                  THE OFFERING
 
Under this prospectus, the selling stockholders named on pages 14 and 15 of this
prospectus are offering and selling shares of our Series A common stock that
they acquired as a result of our acquisition of Narrative Communications Corp.
 
                           -------------------------
 
THIS INVESTMENT INVOLVES A HIGH DEGREE OF RISK.  PLEASE CAREFULLY CONSIDER THE
"RISK FACTORS" BEGINNING ON PAGE 4 OF THIS PROSPECTUS.
 
NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED THESE SECURITIES OR PASSED UPON THE
ADEQUACY OR ACCURACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
 
                  The date of this prospectus is May 20, 1999
 
THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. THE
SELLING STOCKHOLDERS MAY NOT SELL THESE SECURITIES UNTIL THE REGISTRATION
STATEMENT FILED WITH THE SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS
PROSPECTUS IS NOT AN OFFER TO SELL THESE SECURITIES AND IT IS NOT SOLICITING AN
OFFER TO BUY THESE SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT
PERMITTED.
<PAGE>   2
 
                           -------------------------
 
                               TABLE OF CONTENTS
                           -------------------------
 
<TABLE>
<S>                                <C>       <C>                                <C>
Prospectus Summary...............    3       Plan of Distribution.............   20
Risk Factors.....................    4       Legal Matters....................   23
Use of Proceeds..................   13       Experts..........................   23
Dividend Policy..................   13       Forward-Looking Statements.......   23
Selling Stockholders.............   14       Where You Can Find More
                                             Information......................   23
</TABLE>
 
                                        2
<PAGE>   3
 
                               PROSPECTUS SUMMARY
 
     This summary highlights information contained elsewhere in this prospectus.
This summary is not complete and does not contain all the information you should
consider before buying shares in this offering. You should read the entire
prospectus carefully. Unless the context otherwise requires, the terms we, our,
us and At Home refer to At Home Corporation, a Delaware corporation. The share
numbers in this prospectus generally do not reflect the two-for-one stock split
declared by our board on April 16, 1999, which is subject to stockholder
approval.
 
                              AT HOME CORPORATION
 
     We are the leading provider of broadband Internet services to consumers
over the cable television infrastructure. Our primary offering, the @Home
service, allows residential subscribers to connect their personal computers
through cable television wiring infrastructures to a high-speed Internet
backbone network developed and managed by us.
 
     Our @Media group has established the @Home launch screen as the leading
broadband Internet portal, providing a gateway to compelling multimedia and
electronic commerce offerings on the Internet. For businesses, our @Work
services provide a platform for Internet, intranet and extranet connectivity
solutions and networked business applications over both cable infrastructures
and digital telecommunications lines.
 
     @Home, @Home Network, @Media, @Work and the @ball logo are our registered
trademarks, and @Work Internet is our service mark. This prospectus also
includes trademarks of other companies.
 
                                  THE OFFERING
 
     All of the shares offered under this prospectus were originally issued by
us to former Narrative stockholders in connection with our acquisition of
Narrative. The shares offered under this prospectus represent less than 1% of
our outstanding shares of Series A common stock as of April 30, 1999. These
shares are being offered on a continuous basis under Rule 415 of the Securities
Act of 1933 during the period commencing on the effective date of the
registration statement of which this prospectus is a part and ending on December
30, 1999, or as specified in our rights agreement dated December 30, 1998 with
the Narrative stockholders.
 
<TABLE>
<S>                                       <C>
Series A common stock that may be
  offered by selling stockholders.......  919,000 shares
Series A common stock to be outstanding
  after this offering...................  107,705,907 shares*
Series B common stock to be outstanding
  after this offering...................  15,400,000 shares*
Series K common stock to be outstanding
  after this offering...................  2,609,707 shares*
Use of proceeds.........................  We will not receive any proceeds.
Nasdaq National Market symbol...........  ATHM
</TABLE>
 
- -------------------------
* Based on the number of shares outstanding as of April 30, 1999.
 
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<PAGE>   4
 
                                  RISK FACTORS
 
     An investment in our Series A common stock involves a high degree of risk.
You should carefully consider the following risk factors and the other
information in this prospectus before investing in our Series A common stock.
Our business and results of operations could be seriously harmed by any of the
following risks. The trading price of our Series A common stock could decline
due to any of these risks, and you may lose all or part of your investment.
 
     RISKS RELATED TO OUR BUSINESS
 
WE HAVE INCURRED AND EXPECT TO INCUR SUBSTANTIAL LOSSES
 
     We were incorporated in March 1995, commenced operations in August 1995,
and have incurred net losses from operations in each fiscal period since our
inception. As of March 31, 1999, we had an accumulated deficit of $245.3
million. In addition, we currently intend to increase capital expenditures and
operating expenses in order to expand our network and to market and provide our
services to a growing number of potential subscribers. As a result, we expect to
incur additional net losses before cost and amortization of distribution
agreements and amortization of goodwill and other intangible assets for at least
the next three quarters.
 
OUR BUSINESS IS UNPROVEN, AND WE MAY NOT ACHIEVE PROFITABILITY
 
     The profit potential of our business model is unproven. Our @Home service
was available only in portions of 68 geographic markets as of March 31, 1999 and
may not achieve broad consumer or commercial acceptance. Although approximately
2,200 primarily small- and medium-sized business organizations have agreed to
utilize @Work services as of March 31, 1999, our @Work services may not achieve
broad commercial acceptance and the current rate of deployment for @Work
services may not be sustained. We have difficulty predicting whether the pricing
models for our Internet services will prove to be viable, whether demand for our
Internet services will materialize at the prices our cable partners charge for
the @Home service or the prices we or our cable partners charge for @Work
services, or whether current or future pricing levels will be sustainable. If
these pricing levels are not achieved or sustained or if our services do not
achieve or sustain broad market acceptance, our business, operating results and
financial condition will be significantly harmed. We may never achieve favorable
operating results or profitability.
 
GROWTH OF THE @HOME SERVICE MAY BE INHIBITED BY FACTORS BEYOND OUR CONTROL
 
     As of March 31, 1999, we had in excess of 460,000 cable modem subscribers,
including recently acquired Internet subscribers that are being converted to the
@Home service. Our ability to increase the number of subscribers to the @Home
service to achieve our business plans and generate future revenues will depend
on many factors which are beyond our control. For instance, some of our cable
partners have not achieved the subscriber levels that we had originally
anticipated. Other factors include:
 
     - the rate at which our current and future cable partners upgrade their
       cable infrastructures for two-way data services
 
     - our ability and the ability of our cable partners to coordinate timely
       and effective marketing campaigns with the availability of cable
       infrastructure upgrades
 
     - the success of our cable partners in marketing and installing the @Home
       service in their local cable areas
 
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<PAGE>   5
 
     - the prices that our cable partners set for the @Home service and for its
       installation
 
     - the speed at which our cable partners can complete the installations
       required to initiate service for new subscribers
 
     - the commercial availability of self-installable, two-way modems that
       comply with the recently adopted interface standards known as DOCSIS, and
       the success of our roll-out of these products with the @Home service
 
     - the quality of customer and technical support provided by us and our
       cable partners and
 
     - the quality of content on the @Home service.
 
WE NEED TO ADD SUBSCRIBERS AT A RAPID RATE FOR OUR BUSINESS TO SUCCEED, BUT WE
MAY NOT ACHIEVE OUR SUBSCRIBER GROWTH GOALS
 
     Our actual revenues or the rate at which we will add new subscribers may
differ from our forecasts. We may not be able to increase our subscriber base
enough to meet our internal forecasts or the forecasts of industry analysts or
to a level that meets the expectations of investors. The rate at which
subscribers have increased in the past does not necessarily indicate the rate at
which subscribers may be expected to grow in the future. In particular, while we
have forecast that our number of subscribers could grow to over 1.0 million by
December 31, 1999 from more than 460,000 subscribers at March 31, 1999, we may
not achieve this level of subscriber growth.
 
OUR SUBSCRIBER GROWTH DEPENDS ON THE ACTIONS OF OUR CABLE PARTNERS, AND IS
LIMITED BY PRICE AND INSTALLATION CONSTRAINTS
 
     We believe subscriber growth has been constrained, and will continue to be
constrained, by the cost and time required to install the @Home service for each
residential consumer. In addition, our growth has been constrained by the rate
at which our cable partners have upgraded their systems, and most of our cable
partners are not obligated to upgrade their cable infrastructures or market the
@Home service. Moreover, the @Home service is currently priced at a premium to
many other online services, and large numbers of subscribers may not be willing
to pay a premium for the @Home service.
 
IF WE CANNOT MAINTAIN THE SCALABILITY, SPEED AND SECURITY OF OUR NETWORK,
CUSTOMERS WILL NOT ACCEPT OUR SERVICES
 
     Due to the limited deployment of our services, the ability of our network
to connect and manage a substantial number of online subscribers at high
transmission speeds is unknown. Therefore, we face risks related to our
network's ability to be scaled up to its expected subscriber levels while
maintaining superior performance. Our network may be unable to achieve or
maintain a high speed of data transmission, especially as our subscribers
increase. In recent periods, the performance of our network has experienced some
deterioration in some markets as a result of subscriber abuse of the @Home
service. While we seek to eliminate this abuse by limiting users' upstream
bandwidth, our failure to achieve or maintain high-speed data transmission would
significantly reduce consumer demand for our services. In addition, while we
have taken steps to prevent users from sharing files via the @Home service and
to protect against bulk unsolicited e-mail, public concerns about security,
privacy and reliability of the cable network, or actual problems with the
security, privacy or reliability of our network, may inhibit the acceptance of
our Internet services.
 
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<PAGE>   6
 
IF NEW TWO-WAY CABLE MODEMS ARE NOT DEPLOYED TIMELY AND SUCCESSFULLY, WE MAY
NOT BE ABLE TO GROW OUR SUBSCRIBER BASE AS QUICKLY
 
     Each of our subscribers currently must obtain a cable modem from a cable
partner to access the @Home service. The North American cable industry has
recently adopted interface standards known as DOCSIS for hardware and software
to support the delivery of data services over the cable infrastructure utilizing
compatible cable modems. Some of our cable partners have chosen to delay some
deployments of the @Home service until the widespread commercial availability of
DOCSIS-compliant cable modems. Our subscriber growth could be constrained and
our business could be significantly harmed if our cable partners choose to slow
the deployment of the @Home service further. Cable modems that are
DOCSIS-compliant are not expected to be available in significant quantities
until at least the second quarter of 1999. If our cable partners are not able to
obtain a sufficient quantity of DOCSIS-compliant modems, our growth will be
limited.
 
WE COULD LOSE SUBSCRIBERS, DISTRIBUTION RELATIONSHIPS AND REVENUES TO OUR
COMPETITORS
 
     The markets for consumer and business Internet services and online content
are extremely competitive, and we expect that competition will intensify in the
future. Our most direct competitors in these markets include the following:
 
     - Providers of cable-based Internet services.  For example, Time Warner
       Inc. and Media One Group have deployed high-speed Internet access
       services over their local cable networks through their own cable-based
       Internet service, Road Runner. We currently compete with Road Runner to
       establish distribution arrangements with cable system operators, but we
       may compete for subscribers in the future if and when our cable partners
       cease to be subject to their exclusivity obligations.
 
     - Telecommunications providers.  We compete with national long-distance and
       local exchange carriers that offer high-speed, Internet access services
       such as integrated services digital network and asymmetric digital
       subscriber line. If the advanced services offered by these companies are
       deregulated, this would further enhance the ability of these companies to
       compete against our services.
 
     - Internet and online service providers.  We compete with Internet service
       providers that provide basic Internet access services and with online
       service providers such as America Online.
 
     - Internet content aggregators.  We compete with content aggregators and
       Internet portals that seek to capture audience flow by providing
       ease-of-use and offering content that appeals to a broad audience,
       including America Online, Yahoo! Inc. and Lycos, Inc.
 
     Many of our competitors and potential competitors have substantially
greater financial, technical and marketing resources, larger subscriber bases,
longer operating histories, greater name recognition and more established
relationships with advertisers and content and application providers than we do.
These competitors may be able to undertake more extensive marketing campaigns,
adopt more aggressive pricing policies and devote more resources to developing
Internet services or online content than we could. We may not be able to compete
successfully against current or future competitors, and competitive pressures
could significantly harm our subscriber base, our ability to renew and enter
into new distribution agreements and our revenues.
 
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<PAGE>   7
 
OUR DEPENDENCE ON OUR NETWORK EXPOSES US TO A SIGNIFICANT RISK OF SYSTEM FAILURE
 
     Our operations are dependent upon our ability to support our highly complex
network infrastructure and avoid damage from fires, earthquakes, floods, power
losses, telecommunications failures and similar events. The occurrence of a
natural disaster or other unanticipated problem at our network operations center
or at a number of our regional data centers could cause interruptions in our
services. Additionally, failure of our cable partners or companies from which we
obtain data transport services to provide the data communications capacity that
we require, for example as a result of natural disaster, or operational
disruption, could cause interruptions in the services we provide. Any damage or
failure that causes interruptions in our operations could harm our business.
 
YEAR 2000 ISSUES COULD AFFECT THE PERFORMANCE OF OUR SYSTEMS
 
     If our internal and network information systems do not correctly recognize
and process date information beyond the year 1999, we may not be able to conduct
operations. We may also experience supplier-related Year 2000 problems. To
address these Year 2000 issues, we and TCI, our majority stockholder, have
initiated a comprehensive program to address Year 2000 readiness in our systems
and with our customers' and suppliers' systems. Although we currently expect
that the Year 2000 issue will not pose significant operational problems, delays
in the implementation of new information systems or failure to fully identify
all Year 2000 dependencies in our existing systems and in the systems of our
suppliers could harm our business. Therefore, we are developing, but do not yet
have, contingency plans for continuing operations in the event these problems
arise.
 
OUR LIMITED EXPERIENCE WITH INTERNATIONAL EXPANSION MAY PREVENT US FROM GROWING
OUR BUSINESS OUTSIDE THE UNITED STATES
 
     A key component of our strategy is expansion into international markets. To
date, we have developed distribution relationships only with United States,
Canadian and Dutch cable system operators. We have extremely limited experience
in developing localized versions of our products and services and in developing
relationships with international cable system operators. We may not be
successful in expanding our product and service offerings into foreign markets.
In addition to the uncertainty regarding our ability to generate revenues from
foreign operations and expand our international presence, we face specific risks
related to providing Internet services in foreign jurisdictions, including:
 
     -  regulatory requirements, including the regulation of Internet access
 
     - legal uncertainty regarding liability for information retrieved and
       replicated in foreign jurisdictions and
 
     - potential inability to use European customer information due to new
       European governmental regulations.
 
OUR BUSINESS MAY BE IMPACTED BY CABLE UNBUNDLING PROPOSALS AND OTHER GOVERNMENT
REGULATION
 
     Currently, our services are not directly subject to regulations of the
Federal Communication Commission or any other federal, state or local
communications regulatory agency. However, changes could develop in the
regulatory environment relating to the Internet, cable or telecommunications
markets which could require regulatory compliance
 
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<PAGE>   8
 
by us or which could impact our exclusivity arrangements, subscribers and
revenues, including:
 
     - Federal regulation.  Regulatory changes that affect telecommunications
       costs, limit usage of subscriber-related information or increase
       competition from telecommunications companies could affect our pricing or
       ability to market our services successfully. For example, regulation of
       cable television rates may affect the speed at which our cable partners
       upgrade their cable systems to carry our services.
 
     - Regulation by local franchise authorities.  Many of our United States
       cable partners' local cable affiliates have elected to classify the
       provision of the @Home service as additional cable services under their
       local franchise agreements, and to pay franchise fees under those
       agreements. Local franchise authorities may attempt to subject cable
       systems to higher or different franchise fees, taxes or requirements in
       connection with their distribution of the @Home service. There are
       thousands of franchise authorities, and it would be difficult or
       impossible for us or our cable partners to operate under a unified set of
       franchise requirements.
 
     - The FCC or local agencies could require our cable partners to grant our
       competitors access to their cable systems. America Online, MindSpring
       Enterprises, Inc., Consumers Union and other parties have requested the
       FCC to require cable operators to provide Internet and online service
       providers with unbundled access to their cable systems. If we or our
       cable partners are classified as common carriers of Internet services, or
       if the FCC otherwise requires third-party access to their cable
       infrastructures, Internet and online service providers could provide
       services over our cable partners' systems that compete with our services.
       Our cable partners could also be subject to tariffs for the amounts they
       could charge for our services. Also, in local government proceedings,
       Portland and Multnomah County, Oregon have imposed third-party access
       requirements on TCI as a condition of its merger with AT&T, and other
       municipalities such as Los Angeles are considering imposing similar
       requirements.
 
WE COULD FACE LIABILITY FOR DEFAMATORY OR INDECENT CONTENT
 
     Claims could be made against Internet and online service providers under
both United States and foreign law for defamation, negligence, copyright or
trademark infringement, or other theories based on the nature and content of the
materials disseminated through their networks. Several private lawsuits seeking
to impose this liability are currently pending. In addition, legislation has
been proposed that imposes liability for or prohibits the transmission over the
Internet of indecent content. The imposition upon Internet and online service
providers of potential liability for information carried on or disseminated
through their systems could require us to implement measures to reduce our
exposure to this liability. This may require that we expend substantial
resources or discontinue service or product offerings. The increased attention
focused upon liability issues as a result of these lawsuits and legislative
proposals could impact the growth of Internet use. Furthermore, some foreign
governments, such as Germany, have enacted laws and regulations governing
content distributed over the Internet that are more strict than those currently
in place in the United States. One or more of these factors could significantly
harm our business.
 
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<PAGE>   9
 
     RISKS RELATED TO OUR RELATIONSHIPS WITH OUR CABLE PARTNERS
 
     Our agreements with our cable partners are complex. For a summary of some
of the key aspects of these agreements, you should refer to our annual report on
Form 10-K.
 
WE DEPEND ON OUR CABLE PARTNERS TO UPGRADE TO THE TWO-WAY CABLE INFRASTRUCTURE
NECESSARY TO SUPPORT THE @HOME SERVICE; THE AVAILABILITY AND TIMING OF THESE
UPGRADES ARE UNCERTAIN
 
     Transmission of the @Home service and cable-based @Work services depends on
the availability of high-speed two-way hybrid fiber coaxial cable
infrastructure. However, only a portion of existing cable plant in the United
States and in some international markets has been upgraded to two-way hybrid
fiber coaxial cable, and even less is capable of high-speed two-way
transmission. As of March 31, 1999, approximately 25% of our North American
cable partners' cable infrastructure is capable of delivering the @Home service.
Our cable partners have announced and begun to implement major infrastructure
investments in order to deploy two-way hybrid fiber coaxial cable. However,
these investments have placed a significant strain on the financial, managerial,
operating and other resources of our cable partners, most of which are already
highly leveraged. Therefore, these infrastructure investments have been, and we
expect will continue to be, subject to change, delay or cancellation. Although
our commercial success depends on the successful and timely completion of these
infrastructure upgrades, most of our cable partners are under no obligation to
upgrade systems or to introduce, market or promote our services. The failure of
our cable partners to complete these upgrades in a timely and satisfactory
manner, or at all, would prevent us from delivering high-performance Internet
services and would significantly harm our business.
 
OUR CABLE PARTNERS ARE NOT GENERALLY OBLIGATED TO CARRY OUR SERVICES, AND THE
EXCLUSIVITY OBLIGATIONS THAT PREVENT THEM FROM CARRYING COMPETING SERVICES MAY
BE TERMINATED
 
     Our cable partners are subject to exclusivity obligations that prohibit
them from obtaining high-speed, greater than 128 kilobits per second,
residential consumer Internet services from any source other than us. However,
most of our cable partners are under no affirmative obligation to carry any of
our services. Also, the exclusivity obligations of our principal cable partners,
TCI, Comcast, Cox and Cablevision, expire on June 4, 2002, and may be terminated
sooner under some circumstances, including:
 
     - Our principal cable partners may terminate all their exclusivity
       obligations upon a change in law that materially impairs some of their
       rights.
 
     - Comcast or Cox may terminate all exclusivity obligations of our principal
       cable partners at any time if there is a change of control of TCI that
       results within 12 months in the incumbent TCI directors no longer
       constituting a majority of TCI's board. AT&T, TCI, Comcast and Cox have
       agreed, however, that AT&T's acquisition of TCI did not constitute a
       change of control under the terms of the original agreement.
 
     - Cox or Comcast may terminate the exclusivity provisions of our principal
       cable partners if AT&T and its affiliates do not meet @Home subscriber
       penetration levels. On June 4, 1999, we expect that Cox will have this
       right, but Cox has agreed to waive this right for 1999 so long as our
       stockholders approve proposed governance changes prior to July 22, 1999.
 
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<PAGE>   10
 
     - Comcast may terminate its own exclusivity obligations after June 4, 1999
       if it allows us to repurchase a portion of Comcast's equity interest in
       us. Comcast has informed us that it has entered into an agreement with
       Microsoft Corporation under which Microsoft can require Comcast to
       terminate its exclusivity obligations after June 4, 1999.
 
     If the exclusivity obligations of our cable partners are terminated, this
could significantly harm our business and cause an immediate drop in our stock
price.
 
WE ARE CONTROLLED BY TCI AND AT&T
 
     TCI, which recently merged with AT&T, controls approximately 71% of our
voting power and currently has the power to elect a majority of our board
members and to control all matters requiring the approval of our stockholders.
TCI's Series B common stock carries ten votes per share and gives TCI the right
to elect five Series B directors, one of which is designated by Comcast and one
of which is designated by Cox. Currently, four of our ten directors are
directors, officers or employees of TCI or its affiliates, including AT&T. Under
our current corporate governance structure, as long as TCI owns at least
7,700,000 shares of our Series B common stock and holds a majority of our voting
power, our board may take action only if approved by the board and by a majority
of the Series B directors, three of the five of which are designees of TCI. This
allows TCI to block actions of our board, even through the TCI directors may not
then constitute a majority of the board. In addition, TCI can expand the board
at any time and fill the vacancies with TCI designees to control a majority of
the board. After our 1999 annual stockholders meeting, if the proposed
governance changes are adopted, TCI will no longer have the ability to expand
the board and fill vacancies, and approval of at least 75%, or four of the five,
of our Series B directors will be required for most board actions. As a result
of the proposed governing changes we will not be able to take any corporate
actions without the approval of TCI's Series B directors and one, or in some
cases both, of the directors designated by Comcast and Cox. Notwithstanding
these provisions, all of our directors owe fiduciary duties to our stockholders.
AT&T now owns TCI and therefore controls us. Even if and when we complete the
Excite merger, TCI or AT&T will continue to own more than 50% of our voting
power.
 
WE DEPEND ON TCG FOR LOCAL TELECOMMUNICATIONS SERVICES FOR OUR @WORK SERVICES
 
     We depend on TCG, which is owned by AT&T, to provide local
telecommunications services and co-location within TCG's facilities on favorable
economic terms. This relationship enables us to provide @Work services to an
entire metropolitan area in which TCG has facilities. If we were required to
obtain comparable telecommunications services from local exchange carriers, we
would effectively be limited to providing @Work services to commercial customers
within a ten-mile radius of one of our points of presence. As a result, we would
be required to build multiple points of presence to service an entire
metropolitan area, which would substantially increase our capital costs to enter
new markets and which could make market entry uneconomical. If we were required
to pay standard local exchange carrier rates, the ongoing operating costs for
our @Work services would be substantially higher. The loss of our strategic
relationship with TCG would significantly harm our ability to deploy our @Work
services. In addition, TCG has acquired a provider of Internet-related services
to businesses and corporate customers and will compete directly with the @Work
Internet service. To the extent TCG acquires or enters into strategic
relationships with other Internet service providers, TCG may reduce its support
of the @Work services. Although there are alternative suppliers for TCG's
 
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<PAGE>   11
 
services, it could take a significant period of time for us to establish similar
relationships, and equivalent terms might not be available.
 
WE MAY FACE ADDITIONAL COMPETITION FROM AT&T
 
     AT&T operates businesses that could compete with our services,
notwithstanding any exclusivity obligations that may apply to it due to its
ownership of TCI. First, AT&T operates a consumer Internet service known as AT&T
WorldNet. Although AT&T WorldNet is currently a telephone dial-up service that
does not utilize broadband technologies, AT&T may be able to use non-cable-based
data transport mechanisms to offer high-speed residential Internet services that
compete with our @Home service. Second, AT&T owns TCG, which operates an
Internet service for business customers that competes with our @Work service.
Our @Work business depends to a significant extent on our agreement with TCG for
local access telecommunications services. If TCG ceases to cooperate with us,
our @Work business would be harmed. Because our @Work business is not subject to
the cable partners' exclusivity obligations, AT&T or TCG are not limited in
their ability to compete with our @Work business. In addition, AT&T and Time
Warner recently announced the formation of a significant strategic relationship
that will include a joint venture to offer AT&T-branded cable telephony service
to residential and small business customers over Time Warner's existing cable
television systems in 33 states. The relationship between AT&T and Time Warner
could ultimately extend to other broadband services, including cable Internet
services, that compete with our @Home service. AT&T may take actions that
benefit TCG, WorldNet or other services of AT&T or other parties to our
detriment.
 
WARRANTS ISSUED TO OUR CABLE PARTNERS MAY RESULT IN ADDITIONAL DILUTION TO OUR
STOCKHOLDERS
 
     We have entered into agreements with Cablevision Systems Corporation,
Rogers, Shaw and other cable partners under which warrants to purchase a total
of 23,106,722 shares of our Series A common stock were outstanding as of March
31, 1999. Under these agreements, warrants to purchase 10,431,590 shares of our
Series A common stock at an average price of $0.76 per share were exercisable as
of March 31, 1999. To the extent that these cable partners become eligible to
and choose to exercise their warrants, our stockholders would experience
substantial dilution. We also may issue additional stock, or warrants to
purchase stock, at prices less than fair market value in connection with efforts
to expand distribution of the @Home service.
 
     ADDITIONAL RISKS ASSOCIATED WITH OUR ACQUISITION OF EXCITE AND EXCITE'S
BUSINESS
 
WE FACE SEVERAL TRANSITORY RISKS ASSOCIATED WITH OUR ACQUISITION OF EXCITE
 
     In January 1999, we agreed to acquire Excite, Inc., a global Internet media
company. This acquisition is subject to several conditions, including approval
by both companies' stockholders. In addition to the risks associated with
Excite's business generally, this acquisition presents the following risks:
 
     - Our pro forma accounting for the merger may change pending a final
       analysis of the fair values of the assets acquired and liabilities
       assumed. The impact of these changes could be material to our future
       operating results.
 
     - We may encounter substantial difficulties, costs and delays associated
       with integrating the operations of our companies. This process may
       disrupt our business if not completed in a timely and efficient manner.
 
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<PAGE>   12
 
     - The present and potential relationships of us and Excite with sponsors,
       content providers, advertisers, users and subscribers may be harmed by
       the proposed merger.
 
     - We and Excite may lose the right to use intellectual property or other
       contractual rights if we or Excite cannot obtain third party consent,
       waiver or approval of the proposed merger where required under existing
       agreements.
 
     - The merger may result in conflicts associated with exclusive rights that
       both we and Excite have granted to third parties with regard to content,
       sponsorship or other strategic relationships, and failure to resolve
       these conflicts could harm our business.
 
EXCITE HAS NOT BEEN AND MAY NEVER BE PROFITABLE
 
     Excite has incurred significant operating expenses since it was formed. As
of December 31, 1998, Excite had an accumulated deficit of $135.6 million.
Although Excite has had significant revenue growth in recent periods, it may not
be able to sustain this growth in future periods. Excite may never achieve
profitability.
 
EXCITE MAY NO LONGER RECEIVE REVENUES AND USERS FROM NETCENTER
 
     In April 1998, Excite entered into a two-year agreement with Netscape to
provide, host and sell advertising for co-branded content channels, a co-branded
Web search service and a co-branded Web directory service to be offered on
Netscape's Netcenter online service. In April 1999, Excite announced that it had
notified Netscape that it intends to terminate the agreement due to the
acquisition of Netscape by American Online, a competitor of Excite. As a result,
unless the parties renegotiate this agreement or enter into a new agreement,
this agreement will terminate during the second quarter of 1999. If this
agreement is terminated, Excite's revenues could be harmed if it does not
successfully generate new revenues to replace the revenues it was receiving
under this agreement.
 
EXCITE COULD LOSE USERS, ADVERTISERS AND REVENUES TO ITS COMPETITORS
 
     Excite competes with a number of companies both for users and advertisers,
and therefore for revenues. Excite expects this competition will intensify,
particularly because there are few barriers to entry in Excite's market.
Excite's competitors include:
 
     - Web portal companies such as Infoseek's Go Network, Lycos, Netscape's
       Netcenter and Yahoo!
 
     - online service providers such as America Online and Microsoft's MSN
       service
 
     - large media companies such as CBS, NBC, Time-Warner and USA Networks,
       Inc., who have announced initiatives to develop Web services or partner
       with Web companies and
 
     - providers of Web-based advertising solutions, including AdForce,
       advertising management software, including NetGravity, Inc., advertising
       supported content and traditional advertising media.
 
EXCITE DEPENDS ON SPONSORSHIP AGREEMENTS FOR REVENUES
 
     Excite derived approximately 25% of its 1998 advertising revenues from
third parties to provide sponsored services and placements on Excite's Web
sites. These sponsorships typically last for a longer period of time than
traditional banner advertisement purchases. If these sponsorship arrangements do
not meet the advertisers' expectations as to new
 
                                       12
<PAGE>   13
 
customers or increased sales or brand awareness, the sponsors may not renew
their arrangements with Excite. It may also be difficult for Excite to obtain
additional sponsors if potential new sponsors compete with existing sponsors. If
Excite does not renew its existing sponsorships or obtain new sponsors, its
business would be harmed.
 
EXCITE DEPENDS ON SEVERAL THIRD PARTY RELATIONSHIPS FOR USERS, ADVERTISERS AND
REVENUES
 
     Excite depends on a number of third party relationships to provide users
and content for its services, including agreements for links to Excite's
services to be placed on high-traffic Web sites and agreements for third parties
to provide content, games and e-mail for Excite's Web sites. If these
relationships terminate and Excite is not able to replace them, it could lose
users or advertisers, and this could harm Excite's revenues.
 
PRIVACY CONCERNS REGARDING THE USAGE OF DEMOGRAPHIC INFORMATION COULD PREVENT
US AND EXCITE FROM BENEFITING FROM SELLING TARGETED ADVERTISING
 
     Due to privacy concerns regarding the usage of demographic information in
online advertising, some commentators and governmental bodies have suggested
limitations on technology that we and Excite use to deliver targeted advertising
and compile demographic information about users. Any reduction or limitation in
the use of this technology could result in lower advertising rates.
 
POTENTIAL LITIGATION WITH RESPECT TO INTELLECTUAL PROPERTY RIGHTS COULD HARM
EXCITE'S BUSINESS
 
     Many parties, including competitors of Excite, are actively developing
search, indexing and related Internet technologies. Some of these parties have
taken steps to protect these technologies, and Excite believes that others will
follow. Therefore, Excite believes that disputes regarding the ownership of
these technologies are likely to arise in the future. Excite may not be able to
defend any litigation successfully. Even if successful, defending litigation may
be costly and may divert management resources.
 
                                USE OF PROCEEDS
 
     We will not receive any proceeds from sales of Series A common stock by the
selling stockholders under this prospectus.
 
                                DIVIDEND POLICY
 
     We have never paid any cash dividends on our stock. We anticipate that we
will continue to retain any earnings for use in the operation of our business
and we do not currently intend to pay dividends.
 
                                       13
<PAGE>   14
 
                              SELLING STOCKHOLDERS
 
     The following table presents information with respect to the selling
stockholders and the shares of our Series A common stock that they may offer
under this prospectus. Each of the selling stockholders named below was formerly
a stockholder or warrant holder of Narrative who acquired their shares as a
result of our acquisition of Narrative. To our knowledge, none of the selling
stockholders has, or within the past three years has had, any position, office
or other material relationship with us or any of our predecessors or affiliates.
 
     The term selling stockholders includes permitted transferees, such as
assignees by will or testimony. Furthermore, Greylock Equity Limited
Partnership, the Accel entities named below and the Carlyle Entities named below
are venture capital funds which may distribute their shares to their limited
partners. These limited partners may offer and sell shares under this prospectus
as long as the terms and conditions included in their rights agreement with us
are satisfied.
 
     The share information provided in the table below is based on information
provided to us by each of the selling stockholders as of February 12, 1999. Each
of the selling stockholders is currently the beneficial owner of less than 1% of
our outstanding Series A common stock, based on 107,705,907 shares of Series A
common stock outstanding as of April 30, 1999. We calculated beneficial
ownership according to Rule 13d-3 of the Exchange Act as of this date. Under an
escrow agreement, a portion of each selling stockholder's shares is being held
in escrow. Although we list these shares as shares that may be offered in the
table below, these shares may only be offered and sold under this prospectus if
and when these shares are released from escrow and returned to the selling
stockholders. We may update, amend or supplement this prospectus from time to
time to update the disclosure in this section.
 
     The selling stockholders may from time to time offer and sell any or all of
the shares under this prospectus. Because the selling stockholders are not
obligated to sell shares, and because selling stockholders may also acquire
publicly traded shares of our Series A common stock, we cannot estimate how many
shares each selling stockholder will beneficially own after this offering.
 
<TABLE>
<CAPTION>
                                                   SHARES BENEFICIALLY
                                                      OWNED BEFORE        SHARES BEING
                      NAME                            THE OFFERING          OFFERED
                      ----                         -------------------    ------------
<S>                                                <C>                    <C>
Greylock Equity Limited Partnership(1)...........         340,692           302,630
Hilmi Ozguc(2)...................................         213,518            71,270
Scott A. Kliger(2)...............................         213,518            71,270
Accel V L.P.(3)..................................         126,663           126,663
Carlyle Venture Partners L.P.(4).................         115,826           115,826
John B. Landry(5)................................          70,197            70,197
Allison Parker(6)................................          55,614            55,614
Accel Internet/Strategic Technology Fund
  L.P.(3)........................................          16,972            16,972
Carlyle U.S. Venture Partners L.P.(4)............          15,361            15,361
Carlyle Venture Coinvestment L.L.C.(4)(7)........           9,319             9,319
Accel Investors '96 L.P.(3)......................           7,543             7,543
Ellmore C. Patterson Partners(3).................           3,457             3,457
Jamie L. Bertasi(2)..............................           2,758               921
Accel Keiretsu V L.P.(3).........................           2,514             2,514
Silicon Valley Bank(8)...........................           1,776             1,776
</TABLE>
 
                                       14
<PAGE>   15
 
<TABLE>
<CAPTION>
                                                   SHARES BENEFICIALLY
                                                      OWNED BEFORE        SHARES BEING
                      NAME                            THE OFFERING          OFFERED
                      ----                         -------------------    ------------
<S>                                                <C>                    <C>
Grant Schneider(9)(10)...........................           1,654               728
Alexandra Trevelyan(9)(10).......................           1,654             1,241
Patrick W. O'Brien(9)............................           1,448             1,448
John Puopolo(9)..................................           1,117             1,117
Jim Coloprisco(9)................................             820               820
Joanne Bryce(2)..................................             774               774
David White(9)...................................             717               717
Paul Santinelli(9)...............................             689               689
Nancy Wilson(9)..................................             622               622
Cathy Fielding(9)................................             455               455
Sarah Groark(9)..................................             346               346
Carma Makarawicz(2)(10)..........................             164               137
Wei-Meng Chee(9).................................             138               138
Lauren Chatham(9)................................             137               137
Mike Kopel(9)....................................             137               137
Mike Trinkala(9).................................              99                99
                                                        ---------           -------
          TOTALS.................................       1,206,699           919,000
                                                        =========           =======
</TABLE>
 
- ---------------
 (1) After the date of this prospectus, Greylock Equity Limited Partnership may
     distribute its shares of our Series A common stock to:
 
    - Henry F. McCance
    - Howard E. Cox, Jr.
    - David N. Strohm
    - William W. Helman
    - William S. Kaiser
    - Roger L. Evans
    - Mary H. Murphy
    - Barbara P. Murray
    - Oneonta Properties
    - Sherman Fairchild Foundation, Inc.
    - Helen C. Alexander
    - Emory A. Hamilton
    - John D. Alexander, Jr.
    - Caroline R. Alexander
    - Henrietta A. George
    - Dorothy A. Matz
    - Thomas W. Keesee, Jr.
    - McCance Family Limited Partnership
    - Ashbourne Partners III Limited Partnership
    - Henry H. Corning
 
     - Key Trust Company of Ohio, N.A., Theodore T. Jones and Latham W. Murfey,
       III, Trustees of Trust for the benefit of Alison C. Jones under agreement
       established by Edith W. Corning dated 7/25/46 as amended
 
                                       15
<PAGE>   16
 
     - Key Trust Company of Ohio, N.A., Edson Spencer, Jr. and David Warshawsky,
       Trustees of Trust for the benefit of Samuel D. Long under agreement
       established by Edith W. Corning dated 7/25/46 as amended
 
     - Key Trust Company of Ohio, N.A., Edson Spencer, Jr. and David Warshawsky
       Trustees of Trust for the benefit of Maud-Alison Long under agreement
       established by Edith W. Corning dated 7/25/46 as amended
 
     - Key Trust Company of Ohio, N.A., Edson Spencer, Jr. David Warshawsky
       Trustees of Trust for the benefit of Henry H. Corning under agreement
       established by Edith W. Corning dated 7/25/46 as amended
 
    - Michael J. Birck
    - Dartmouth College
    - Field Venture Partners
    - Gothic Corporation, Michael J. Birck
    - Poduska Family Limited Partnership TLP
    - The Northern Trust Company
    - Robert E. Cook
    - Gabriel Schmergel
    - Trustee of The Daisy Trust
    - John W. Brown Trust
    - Thomas H. Bruggere
    - Peter Preuss
    - Grossman Family Partnership or its nominee Saturn & Co.
    - William C. O'Neil, Jr.
    - Curt A. Rawley
    - William J. Warner
    - John M. Connolly
    - Mone Anathan, III
    - Samuel J. Gerson
    - Ronald J. Friedsam
    - David C. Mahoney
    - Tadeusz Witkowicz
    - James A. Perakis
    - Joshua Boger
    - Malcolm L. Gefter
    - Dirk I. Gates
    - Goel Family Partnership
    - Safi U. Qureshey, Trustee of Safi U. Qureshey Family Trust dated 5/21/84
    - William M. Gibson
    - Alexander V. d'Arbeloff
    - Irwin F. Smith
    - Donald K. Miller
    - Robert A. Lawrence
    - Hill and Company
    - Neil L. Thompson
    - PH Investments LLC
    - Frechette Fund, Inc.
    - PCW Fund, Inc.
    - Scaup & Co.
     - Massachusetts Institute of Technology
 
                                       16
<PAGE>   17
 
     - Edward H. Ladd, Trustee under agreement dated 12/15/78 or its nominee,
       Freya Fanning & Co.
     - M-C Partners I Limited Partnership or its nominees, A. A. Welsh & Co. and
       Atwell & Co.
    - Fleet National Bank, Trustee of Orchard Trust under agreement dated 5/1/73
    - Phemus Corporation
    - John Lillard Family Limited Partnership
    - Lillard Partners
    - Louis F. Polk, Jr. Marital Trust
    - Louis F. Polk, Jr., Trustee of Louis F. Polk, Sr. Rev. Trust dated 1/22/69
    - Paula P. Lillard, Trustee of Louis F. Polk, Sr. Rev Trust dated 1/22/69
    - Board of Trustees of Leland Stanford Junior University
    - Polk Family Partnership,
    - Brinkley S. Thorne
    - Julia L. Thorne Trust under agreement dated 9/29/65
    - Wink Thorne
    - Edwin Thorne
    - Benjamin Thorne
    - Standish Ventures III Limited Partnership
    - Snowball Trust
    - Edwin Thorne Sole Trustee
    - Jennifer Hislop
    - Gordon G. Thorne
    - Brooks Walker, Jr.
    - Brooks Walker, Jr. Trustee of M.K. Walker Trust dated 9/1/89
    - Wellington S. Henderson, Trustee of Welling S. Henderson, Jr. Revocable
      Trust dated 3/9/93
     - Harriett W. Henderson Trust under agreement dated 8/14/73 for the benefit
       of Charles C. Henderson
     - Brooks Walker III, Trustee of Walker Trust dated 12/24/74
     - Harriett W. Henderson Trust under agreement dated 8/14/73 for the benefit
       of James A. Henderson
     - Harriett W. Henderson Trust under agreement dated 8/14/73 for the benefit
       of Joan H. Henderson
     - Harriett W. Henderson Trust under agreement dated 8/14/73 for the benefit
       of Elena D. Henderson
     - Harriett W. Henderson Trust under agreement dated 8/14/73 for the benefit
       of Mark W. Henderson
     - Ann M. Hatch Revocable Trust No. 2
     - Richard Greene Trust for the benefit of Francis Timothy Hatch
     - Susanna B. Place, Trustee SMBP Trust under agreement dated 2/28/85
     - David Ayer
     - William Elfers
     - Essex Equity Limited Partnership V
     - Frederick H. Bruenner
     - David E. Place
     - Richard M. Place
     - Daniel S. Gregory and Richard N. Hoehn, Trustees, under instrument
       Place/Greylock Trust dated 12/27/78
 
                                       17
<PAGE>   18
 
     - Roger L. Evans, Trustee of Roger and Jacqueline Evans Family Trust under
       agreement dated 3/8/89
     - Stephen Bochner, Trustee Evans Children's Trust under agreement dated
       12/20/93
     - Arthur Hughes, Trustee under instrument dated 2/2/94 Helman Children's
       Trust for the benefit of Beatrice Page Helman
     - Arthur Hughes, Trustee under instrument dated 2/2/94 Helman Children's
       Trust for the benefit of William Wilson Helman V
     - Robert N. Shapiro, Trustee of Robert P. Henderson 1994 Irrevocable Trust
       dated 1/19/94
     - Elizabeth McCance
     - Thomas McCance, Jr. and Keith Jennings, Trustees under agreement dated
       11/16/76 for the benefit of Ellen L. McCance
     - Henry F. McCance, Allison J. McCance and Keith S. Jennings under
       instrument dated 12/22/93 Trustees of McCance Family Trust for the
       benefit of Ellen Lee McCance
     - Henry F. McCance, Allison J. McCance and Keith S. Jennings under
       instrument dated 12/22/93 Trustees of McCance Family Trust for the
       benefit of Elizabeth Ferguson McCance
     - Daniel Moseley, Trustee under agreement with Blodgett 1989 Family Trust
     - John B. Jessup, Trustee of Julia Thorne Trust dated 9/29/65
     - William S. Kaiser
     - Charles and Angela Waite
     - Thomas J. Watson, III
     - Miriam A. Gilpatric
     - Yale University
 
 (2) The selling stockholder is an employee of At Home, with address at: care of
     At Home Corporation, 425 Broadway Street, Redwood City, California 94063.
 
 (3) The selling stockholder is a limited partnership affiliated with Accel
     Partners, with address at: care of Accel Partners, attn: Carter Sednaoui,
     One Palmer Square, Princeton, New Jersey 08542.
 
 (4) The selling stockholder is a limited partnership affiliated with The
     Carlyle Group, with address at: care of The Carlyle Group, attn: Brian
     Hayhurst, 1001 Pennsylvania Avenue, N.W., Washington, D.C. 20004-2505.
 
 (5) Mr. Landry is the former Chairman of Narrative.
 
 (6) Ms. Parker is a former employee and co-founder of Narrative.
 
 (7) After the date of this prospectus, Carlyle Venture Coinvestment L.L.C. may
     distribute its shares of our Series A common stock to:
    - Allan M. Holt
    - Brian Bailey
    - Brian Hayhurst
    - Brooke Coburn
    - Cammack Holdings Corporation
    - David Henderson
    - David W. Dupree
    - Edward J. Mathias
    - Frank C. Carlucci
 
                                       18
<PAGE>   19
 
- - Frontier Ventures Corporation
- - Harry L. Alverson
- - James A. Baker, III
- - Jerome H. Powell
- - J. Mitchell Reese
- - Orange Crimson Holdings Corporation
- - Ryan Schwarz
- - Stupar Holdings Corporation
- - Sulaiman S. Mamdani
 
 (8) Silicon Valley Bank is currently a lender to At Home. Its address is care
     of Silicon Valley Bancshares, attn: David Jaques, 3003 Tasman Drive
     (HG100), Santa Clara, California 95054.
 
 (9) The selling stockholder formerly had an employment relationship with
     Narrative.
 
(10) The selling stockholder's beneficial ownership includes shares subject to
     options that were exercisable as of April 14, 1999.
 
                                       19
<PAGE>   20
 
                              PLAN OF DISTRIBUTION
 
     The selling stockholders will be offering and selling all shares offered
and sold under this prospectus. We will not receive any of the proceeds of the
sales of these shares. In connection with our acquisition of Narrative, we
entered into a rights agreement dated December 30, 1998 with all of the selling
stockholders. Shares may only be offered or sold under this prospectus under the
terms of the rights agreement. However, selling stockholders may resell all or a
portion of their shares in open market transactions in reliance upon Rule 144
under the Securities Act, provided they meet the criteria and conform to the
requirements of this rule. Shares may only be offered or sold under this
prospectus during the normal quarterly trading windows specified by our insider
trading policy. Each trading window typically begins on the third trading day
after we publicly report our operating results for the previous calendar quarter
and ends on the last day of the second month of each respective calendar quarter
(February, May, August and November).
 
     Who may sell and applicable restrictions. The shares may be sold directly
by the selling stockholders from time to time. The selling stockholders may
decide not to sell any of the shares offered under this prospectus, and selling
stockholders could transfer, devise or gift these shares by other means.
 
     Alternatively, the selling stockholders may from time to time offer the
shares through brokers, dealers or agents that may receive compensation in the
form of discounts, concessions or commissions from the selling stockholders
and/or the purchasers of the shares for whom they may act as agent. In effecting
sales, broker-dealers that are engaged by the selling stockholders may arrange
for other broker-dealers to participate. The selling stockholders and any
brokers, dealers or agents who participate in the distribution of the shares may
be deemed to be underwriters. Any profit on the sale of the shares by them and
any discounts, commissions or concessions received by any broker, dealer or
agent might be deemed to be underwriting discounts and commissions under the
Securities Act. To the extent the selling stockholders may be deemed to be
underwriters, the selling stockholders may be subject to statutory liabilities,
including, but not limited to, Sections 11, 12 and 17 of the Securities Act and
Rule 10b-5 under the Exchange Act.
 
     Shares that may not be sold under this prospectus. Under an escrow
agreement dated December 30, 1998, we will hold in escrow a total of
approximately 134,647 shares that are beneficially owned by the selling
stockholders until no later than March 31, 2000. Subject to limited exceptions,
these shares may not be sold or transferred without our consent.
 
     Selling stockholders who are designated as key employees in the rights
agreement are restricted from disposing of their shares until December 30, 2001,
except that:
 
     - each key employee may currently dispose of up to 25% of his restricted
       shares
 
     - each key employee may dispose of up to another 25% of his restricted
       shares on and after December 30, 1999 if he is still employed by us on
       that date and
 
     - each key employee may dispose of his remaining restricted shares on and
       after December 30, 2000 if he is still employed by us on that date.
 
Each key employee may only offer or sell 25% of his restricted shares under this
prospectus.
 
                                       20
<PAGE>   21
 
     Prospectus delivery. Because selling stockholders may be deemed to be
underwriters within the meaning of Section 2(11) of the Securities Act, they
will be subject to the prospectus delivery requirements of the Securities Act.
At any time a particular offer of the shares is made, a revised prospectus or
prospectus supplement, if required, will be distributed which will disclose:
 
     - the name of the selling stockholder and of any participating
       underwriters, broker-dealers or agents
 
     - the aggregate amount and type of shares being offered
 
     - the price at which the shares were sold and other material terms of the
       offering
 
     - any discounts, commissions, concessions and other items constituting
       compensation from the selling stockholders and any discounts, commissions
       or concessions allowed or paid to dealers and
 
     - that the participating broker-dealers did not conduct any investigation
       to verify the information in this prospectus or incorporated by reference
       in this prospectus.
 
The prospectus supplement or a post-effective amendment will be filed with the
Securities and Exchange Commission to reflect the disclosure of additional
information with respect to the distribution of the shares. In addition, if we
receive notice from a selling stockholder that a donee or pledgee intends to
sell more than 500 shares, a supplement to this prospectus will be filed.
 
     Manner of sales. The selling stockholders will act independently from us in
making decisions with respect to the timing, manner and size of each sale. Sales
may be made over the Nasdaq National Market. The shares may be sold at then
prevailing market prices, at prices related to prevailing market prices or at
negotiated prices. The shares may be sold according to one or more of the
following methods:
 
     - a block trade in which the involved broker or dealer will attempt to sell
       the shares as agent but may position and resell a portion of the block as
       principal to facilitate the transaction
 
     - purchases by a broker or dealer as principal and resale by the broker or
       dealer for its account as allowed under this prospectus
 
     - ordinary brokerage transactions and transactions in which the broker
       solicits purchasers
 
     - an exchange distribution under the rules of the exchange
 
     - face-to-face transactions between sellers and purchasers without a
       broker-dealer and
 
     - by writing options.
 
     SOME PERSONS PARTICIPATING IN THIS OFFERING MAY ENGAGE IN TRANSACTIONS THAT
STABILIZE, MAINTAIN OR OTHERWISE AFFECT THE PRICE OF OUR SERIES A COMMON STOCK,
INCLUDING THE ENTRY OF STABILIZING BIDS OR SYNDICATE COVERING TRANSACTIONS OR
THE IMPOSITION OF PENALTY BIDS. The selling stockholders and any other person
participating in a distribution will be subject to applicable provisions of the
Exchange Act and its rules and regulations, including Regulation M. This
regulation may limit the timing of purchases and sales of any of the shares by
the selling stockholders and any other person. The anti-manipulation rules under
the Exchange Act may apply to sales of shares in the market and to the
activities of the selling stockholders and their affiliates. Furthermore,
Regulation M of the Exchange Act may restrict the ability of any person engaged
in the distribution of the shares to engage in market-making
 
                                       21
<PAGE>   22
 
activities with respect to the particular shares being distributed for a period
of up to five business days before the distribution. All of the foregoing may
affect the marketability of the shares and the ability of any person or entity
to engage in market-making activities with respect to the shares.
 
     Hedging and other transactions with broker-dealers. In connection with
distributions of the shares, the selling stockholders may enter into hedging
transactions with broker-dealers. In connection with these transactions,
broker-dealers may engage in short sales of the registered shares in the course
of hedging the positions they assume with selling stockholders. The selling
stockholders may also sell shares short and redeliver the shares to close out
their short positions. The selling stockholders may also enter into option or
other transactions with broker-dealers which require the delivery to the
broker-dealer of the registered shares. The broker-dealer may then resell or
transfer these shares under this prospectus. A selling stockholder may also loan
or pledge the registered shares to a broker-dealer and the broker-dealer may
sell the shares so loaned or, upon a default, the broker-dealer may effect sales
of the pledged shares under this prospectus.
 
     Expenses associated with registration. We have agreed to pay the expenses
of registering the shares under the Securities Act, including registration and
filing fees, printing expenses, administrative expenses and legal and accounting
fees. Each of the selling stockholders will bear its pro rata share of all
discounts, commissions or other amounts payable to underwriters, dealers or
agents as well as fees and disbursements for legal counsel retained by any
selling stockholder.
 
     Indemnification. In the rights agreement, we and the selling stockholders
have agreed to indemnify each other and specified other persons against some
liabilities in connection with the offering of the shares, including liabilities
arising under the Securities Act. The selling stockholders may also agree to
indemnify any broker-dealer or agent that participates in transactions involving
sales of the shares against some liabilities, including liabilities arising
under the Securities Act. In addition, Carlyle Venture Coinvestment LLC and
Greylock Equity Limited Partnership have each agreed to indemnify us against
some liabilities, including liabilities arising under the Securities Act,
related to information about selling stockholders that was provided by each of
these two parties.
 
     Suspension of this offering. We may suspend the use of this prospectus if
we learn of any event that causes this prospectus to include an untrue statement
of a material fact or omits to state a material fact required to be stated in
the prospectus or necessary to make the statements in the prospectus not
misleading in the light of the circumstances then existing. If this type of
event occurs, a prospectus supplement or post-effective amendment, if required,
will be distributed to each selling stockholder. Each selling stockholder has
agreed not to trade shares from the time the selling stockholder receives notice
from us of this type of event until the selling stockholder receives a
prospectus supplement or amendment. This time period will not exceed five
trading days in any one instance.
 
     Termination of this offering. The rights agreement requires that we use
commercially reasonable efforts to keep the registration statement effective
until December 30, 1999, or later in limited circumstances. Therefore, this
offering will terminate on the earlier of: (1) the expiration of this period, or
(2) the date on which all shares offered under this prospectus have been sold by
the selling stockholders.
 
                                       22
<PAGE>   23
 
                                 LEGAL MATTERS
 
     The validity of the issuance of the shares of common stock offered under
this prospectus will be passed upon for us by Fenwick & West LLP, Two Palo Alto
Square, Palo Alto, California 94306.
 
                                    EXPERTS
 
     Ernst & Young LLP, independent auditors, have audited our consolidated
financial statements included in our Annual Report on Form 10-K for the year
ended December 31, 1998, as amended, as presented in their report, which is
incorporated by reference in this prospectus and elsewhere in the registration
statement. Our financial statements are incorporated by reference in reliance on
the report of Ernst & Young LLP given on their authority as experts in
accounting and auditing.
 
     The financial statements of Narrative incorporated in this prospectus by
reference to the audited historical financial statements included as Exhibit
99.01 of our Form 8-K/A filed on February 18, 1999 have been incorporated in
reliance on the report of PricewaterhouseCoopers LLP, independent accountants,
given on their authority as experts in auditing and accounting.
 
                           FORWARD-LOOKING STATEMENTS
 
     This prospectus contains forward-looking statements within the meaning of
Section 27A of the Securities Act and Section 21E of the Exchange Act relating
to future events or financial results. These statements include statements
indicating that we believe, we expect or we anticipate that events may occur or
trends may continue, and similar statements relating to future events or
financial results. These forward-looking statements are subject to material
risks and uncertainties as indicated under the caption "Risk Factors." Actual
results could vary materially as a result of a number of factors including those
disclosed in "Risk Factors" and elsewhere in this prospectus.
 
                      WHERE YOU CAN FIND MORE INFORMATION
 
     The following documents that we have filed with the Securities and Exchange
Commission are incorporated into this prospectus by reference:
 
     - the registration statement on Form S-3 of which this prospectus is a
       part, and the exhibits and schedules filed with the registration
       statement and incorporated into the registration statement by reference
 
     - our annual report on Form 10-K for the year ended December 31, 1998, as
       amended on March 31, 1999 and on April 27, 1999
 
     - the registration of our Series A common stock on Form 8-A filed on June
       13, 1997
 
     - all other reports filed under Section 13(a) or 15(d) of the Exchange Act
       since December 31, 1998, including: (1) our quarterly reports on Form
       10-Q for the quarters ended March 31, June 30 and September 30, 1998,
       each as amended on February 8, 1999; (2) our quarterly report on Form
       10-Q for quarter ended March 31, 1999; (3) our current report on Form 8-K
       filed on January 14, 1999, as amended on February 19, 1999; (4) our two
       current reports on Form 8-K filed on January 21, 1999; (5) our current
       report on Form 8-K filed on February 19, 1999; and (6) our current report
       on Form 8-K filed on April 8, 1999 and
 
                                       23
<PAGE>   24
 
     - all other information that we file with the Securities and Exchange
       Commission under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act
       after the date of this prospectus and before the termination of this
       offering.
 
     To the extent that any statement in this prospectus is inconsistent with
any statement that is incorporated by reference, the statement in this
prospectus shall control. The incorporated statement shall not be deemed, except
as modified or superceded, to constitute a part of this prospectus or the
registration statement.
 
     Because we are subject to the informational requirements of the Securities
Exchange Act of 1934, we file reports and other information with the Securities
and Exchange Commission. Reports, registration statements, proxy and information
statements and other information that we have filed can be inspected and copied
at the public reference facilities maintained by the Commission at Room 1024,
450 Fifth Street, N.W., Washington, D.C. 20549. You may obtain copies of this
material from the Public Reference Section of the Commission at 450 Fifth
Street, N.W., Washington, D.C. 20549 at rates prescribed by the Commission. The
public may obtain information on the operation of the Public Reference Room by
calling the Commission at 1-800-SEC-0330. The Commission also maintains a World
Wide Web site that contains reports, proxy and information statements and other
information that is filed electronically with the Commission. This web site can
be accessed at http://www.sec.gov.
 
     We have filed with the Commission a registration statement on Form S-3
under the Securities Act with respect to the Series A common stock offered under
this prospectus. This prospectus does not contain all of the information in the
registration statement, parts of which we have omitted, as allowed under the
rules and regulations of the Commission. For further information with respect to
us and our Series A common stock, please refer to the registration statement.
Statements contained in this prospectus as to the contents of any contract or
other document are not necessarily complete and, in each instance, we refer you
to the copy of each contract or document filed as an exhibit to the registration
statement. Copies of the registration statement, including exhibits, may be
inspected without charge at the Commission's principal office in Washington,
D.C., and you may obtain copies from this office upon payment of the fees
prescribed by the Commission.
 
     We will furnish without charge to each person to whom a copy of this
prospectus is delivered, upon written or oral request, a copy of the information
that has been incorporated by reference into this prospectus (except exhibits,
unless they are specifically incorporated by reference into this prospectus).
You should direct any requests for copies to At Home Corporation, 425 Broadway
Street, Redwood City, California 94063, Attention: David G. Pine, Vice President
and General Counsel, telephone: (650) 569-5000.
 
                                       24
<PAGE>   25
 
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                              AT HOME CORPORATION
 
                               919,000 SHARES OF
                             SERIES A COMMON STOCK
 
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                                   PROSPECTUS
                 ---------------------------------------------
 
     YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED IN OR INCORPORATED BY
REFERENCE IN THIS PROSPECTUS. WE HAVE NOT AUTHORIZED ANYONE TO PROVIDE YOU WITH
DIFFERENT INFORMATION. WE ARE NOT MAKING AN OFFER OF THESE SECURITIES IN ANY
STATE WHERE THE OFFER IS NOT PERMITTED. YOU SHOULD NOT ASSUME THAT THE
INFORMATION CONTAINED IN OR INCORPORATED BY REFERENCE IN THIS PROSPECTUS IS
ACCURATE AS OF ANY DATE OTHER THAN THE DATE OF THIS PROSPECTUS.
 
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